Simply connect vacuum to USB port of computer, no need of external power supply.
Including two vacuum attachments: bristle brush attachment & flexible rubber.
Two switch level: press "high" power switch to boost the suction power for the vacuuming heavy dirt and dust.
Use keyboard attachment rubber for vacuuming the dust and particle on the keyboard by sliding the squeezable tube between keys.
Use brush tube for general cleaning of air vents(fans), monitor of dust on desktop.
Can be used to clean the digital camera, monitor, TV, mobile phone and etc.Several colors for your reference, color mixed if you don't advise.A great choice as promotional gifts.